Overwrite fonts?

rockster · 09-23-2025, 12:45 PM

Is there a way to overwrite the font in a epub book? I couldn't find option for this. I am using the linux version of Calibre.

kovidgoyal · 09-23-2025, 02:12 PM

You can specify whatever CSS you like in the styles section of the viewer preferences including fonts.

rockster · 09-23-2025, 05:39 PM

How is that different than specifying the font in the Fonts section?

theducks · 09-23-2025, 07:14 PM

Quote:

Originally Posted by rockster

How is that different than specifying the font in the Fonts section?

Fonts Section is what will be used when a generic is called or no font WAS specified in the stylesheet/book.
Styles is where you make your desires (font family) known. The font must be available (system or embedded in the book)

eg

Code:

@font-face {
  font-family: Cinzel;
  font-weight: normal;
  font-style: normal;
  src: url(fonts/00002.ttf);
}

and the Stylesheet call:

Code:

.first-letter2 {
  float: left;
  font-family: Cinzel, serif;
  font-size: 300%;
  font-style: normal;
  font-weight: normal;
  margin-right: 0.18em;
  margin-top: -0.25em;
  text-decoration: none;
  text-transform: uppercase;
}

Note what i made bold
That is the fallback if the font is not available (should not be needed if embedded in the book)

rockster · Yesterday, 07:15 AM

i tried this css style, but it didn't work:

Code:

* {
    font-family: "Liberation Serif", serif !important;
}

Martinoptic · Yesterday, 03:50 PM

Why are you using " ?
Try Liberation Serif rather than "Liberation Serif"

rockster · Today, 06:22 AM

This css style worked (with ai help):

Code:

@font-face {
    font-family: "my-custom-font";
    src: local("Georgia");
}

* {
    font-family: "my-custom-font", serif !important;
}

theducks · Today, 09:59 AM

Quote:

Originally Posted by Martinoptic

Why are you using " ?
Try Liberation Serif rather than "Liberation Serif"

values with spaces need to be quoted

Martinoptic · Today, 05:00 PM

Thank you.

09-23-2025, 12:45 PM	#1
rockster Connoisseur Posts: 56 Karma: 10 Join Date: Sep 2012 Device: kindle	Overwrite fonts? Is there a way to overwrite the font in a epub book? I couldn't find option for this. I am using the linux version of Calibre.

Yesterday, 07:15 AM	#5
rockster Connoisseur Posts: 56 Karma: 10 Join Date: Sep 2012 Device: kindle	i tried this css style, but it didn't work: Code: * { font-family: "Liberation Serif", serif !important; }

Today, 06:22 AM	#7
rockster Connoisseur Posts: 56 Karma: 10 Join Date: Sep 2012 Device: kindle	This css style worked (with ai help): Code: @font-face { font-family: "my-custom-font"; src: local("Georgia"); } * { font-family: "my-custom-font", serif !important; }

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09-23-2025, 02:12 PM	#2
kovidgoyal creator of calibre Posts: 45,531 Karma: 28548962 Join Date: Oct 2006 Location: Mumbai, India Device: Various	You can specify whatever CSS you like in the styles section of the viewer preferences including fonts.

09-23-2025, 05:39 PM	#3
rockster Connoisseur Posts: 56 Karma: 10 Join Date: Sep 2012 Device: kindle	How is that different than specifying the font in the Fonts section?

Yesterday, 03:50 PM	#6
Martinoptic Bibliophist Posts: 7,384 Karma: 7237230 Join Date: Dec 2021 Location: England Device: none	Why are you using " ? Try Liberation Serif rather than "Liberation Serif"

Today, 05:00 PM	#9
Martinoptic Bibliophist Posts: 7,384 Karma: 7237230 Join Date: Dec 2021 Location: England Device: none	Thank you.

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